Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cca13fcdf6870c…

MALICIOUS

PDF

83.8 KB Created: 2020-11-20 00:34:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0a064973a3a81ca3981aa85b6f6c4ba1 SHA-1: df868078d24f5b599a6a742256a73dee62c4f97a SHA-256: 51cca13fcdf6870c93e38dfb3ff20dca9dce081efbfe9f6398f537a8a3d00e54
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffnew.ru/123?utm_term=viridian+weapon+technologies+stock+symbol PDF link annotation
    • https://dofenerezi.weebly.com/uploads/1/3/4/4/134446603/18c920ff36.pdfIn PDF document text
    • https://nalakipivexovob.weebly.com/uploads/1/3/4/3/134385055/2246085.pdfIn PDF document text
    • https://wovuxekas.weebly.com/uploads/1/3/4/3/134379471/pipitobemivi.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/307af5c2.pdfIn PDF document text
    • https://sewuvemap.weebly.com/uploads/1/3/4/3/134377394/bde8b05351ac8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378621/normal_5f8acdd859714.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/buvovulaminotufazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b03c81-e87e-4d93-9078-b0858dcfb7c7/cell_passive_transport_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/exploracion_nervio_facial.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/kafenowonasoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b041376-24d6-44b6-9326-4d5dbfaf6855/78427252743.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 5852 bytes
SHA-256: 57d3b47e49e97a4e3c558ecf34d9c5943a492a96152f90eb156ed5cdd8445bd6
font_01_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 12312 bytes
SHA-256: 44379ac579c21d2fd7d2f1d1f1eb6cf4ff34302fadb3fc6888f8754a2de33f06

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